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/*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Erik Hallnor
* Dave Greene
*/
/**
* @file
* Miss Status and Handling Register (MSHR) definitions.
*/
#include <assert.h>
#include <string>
#include <vector>
#include "mem/cache/miss/mshr.hh"
#include "sim/root.hh" // for curTick
#include "sim/host.hh"
#include "base/misc.hh"
#include "mem/cache/cache.hh"
using namespace std;
MSHR::MSHR()
{
inService = false;
ntargets = 0;
threadNum = -1;
}
void
MSHR::allocate(Packet::Command cmd, Addr _addr, int size,
Packet * &target)
{
addr = _addr;
if (target)
{
//Have a request, just use it
pkt = new Packet(target->req, cmd, Packet::Broadcast, size);
pkt->time = curTick;
pkt->allocate();
pkt->senderState = (Packet::SenderState *)this;
allocateTarget(target);
}
else
{
//need a request first
Request * req = new Request();
req->setPhys(addr, size, 0);
//Thread context??
pkt = new Packet(req, cmd, Packet::Broadcast, size);
pkt->time = curTick;
pkt->allocate();
pkt->senderState = (Packet::SenderState *)this;
}
}
// Since we aren't sure if data is being used, don't copy here.
/**
* @todo When we have a "global" data flag, might want to copy data here.
*/
void
MSHR::allocateAsBuffer(Packet * &target)
{
addr = target->getAddr();
threadNum = target->req->getThreadNum();
pkt = new Packet(target->req, target->cmd, -1);
pkt->allocate();
pkt->senderState = (Packet::SenderState*)this;
pkt->time = curTick;
}
void
MSHR::deallocate()
{
assert(targets.empty());
assert(ntargets == 0);
pkt = NULL;
inService = false;
//allocIter = NULL;
//readyIter = NULL;
}
/*
* Adds a target to an MSHR
*/
void
MSHR::allocateTarget(Packet * &target)
{
//If we append an invalidate and we issued a read to the bus,
//but now have some pending writes, we need to move
//the invalidate to before the first non-read
if (inService && pkt->isRead() && target->isInvalidate()) {
std::list<Packet *> temp;
while (!targets.empty()) {
if (!targets.front()->isRead()) break;
//Place on top of temp stack
temp.push_front(targets.front());
//Remove from targets
targets.pop_front();
}
//Now that we have all the reads off until first non-read, we can
//place the invalidate on
targets.push_front(target);
//Now we pop off the temp_stack and put them back
while (!temp.empty()) {
targets.push_front(temp.front());
temp.pop_front();
}
}
else {
targets.push_back(target);
}
++ntargets;
assert(targets.size() == ntargets);
/**
* @todo really prioritize the target commands.
*/
if (!inService && target->isWrite()) {
pkt->cmd = Packet::WriteReq;
}
}
void
MSHR::dump()
{
ccprintf(cerr,
"inService: %d thread: %d\n"
"Addr: %x ntargets %d\n"
"Targets:\n",
inService, threadNum, addr, ntargets);
TargetListIterator tar_it = targets.begin();
for (int i = 0; i < ntargets; i++) {
assert(tar_it != targets.end());
ccprintf(cerr, "\t%d: Addr: %x cmd: %d\n",
i, (*tar_it)->getAddr(), (*tar_it)->cmdToIndex());
tar_it++;
}
ccprintf(cerr, "\n");
}
MSHR::~MSHR()
{
if (pkt)
pkt = NULL;
}
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